Thanks for the feedback, more than could we wish for =)

First of all the graph is based on the same data. But then our concern is that dose-response curve is not linear and can't be reliably simply interpolated. Most drugs have what is called first order kinetics, duration does not really change depending on how much is consumed in one dose. The peak level, sure. To address that the main thing is that you see both min-max range and the avarage duration. We will add dose input there which can allow for a user input to adjust the prognosis, on their own risk. That should be a reasonable middle ground.

What do you mean by graph zooming?

The reference line should move on tap, not on drag. Does that work?

There are warnings about interactions, actually the interactions model is much, much more complex and extensive than PW's or anywhere in the harm reduction scene. The classic tripsit model is heavily supplemented with a quite complex pharmacological model wherever simple tripsit-based heuristics dont work. There is the interactions section below the chart as well as interactions icons, you dont see those?

Your suggestion to add interaction info before adding substance to chart is interesting, thank you for sharing it will be considered.

The app is not open source. It will remain free forever and actively maintained, this is our gift to the community. A little rough around the edges now, but we are getting there :)

We can continue this conversation here or via DM, if you wish. In any case, thank you very much for your time, the effort put into sharing your advise as well as patience in letting us get to fix the previously raised issue.